LADIES!!! what does it mean...?

OK so i kow this girl in one of my cles and i am kinda interested in her. so the other day i was talking to her and she asks if she could borrow my phone because she "can't find her phone" so i give her my phone and she calls her phone and finds it. she said she kinda knew where it was but wanted to use mine anyway to help find it. so i'm asking if that was some inventive way to put her phone number on my phone or am i just being too ytical. should i call her or the next time i see her ask her... "hey i noticed that ur number was still in my phone and i was wondering if i might be able to call you sometime on it?"